hmmm I just reread your post, based on the DynoDynamic to DynoJet conversion I would be looking at 320ish as well...

Maybe I do need to spend the $$ on AI and start running a water meth mix to get more.

I think those numbers are reasonable as well. With 10 psi on bolt-ons, stock ports, stock fuel, RP mapped ECU, & stock seq. turbos I dyno'd 300whp uncorrected on a humid 95 degree day with NO FAN, lol heatsoak. The corrected number was 321whp, but the SAE correction isn't really accurate for turbocharged engines. (Dynojet numbers)

I ran at 14 psi occasionally and that car pulled like a raped ape up top. AFR's were solid, although I'm sure I was close to maxing out the injectors.

I never took the car to the track, but on the street I was able to easily run down a few low 12 second cars.

Thats the ticket... Go to the track and get a trap speed, that tells all..


I am trying to go back and find my stock twin dyno. It was 323 at around 13-14psi. Bottom line is stock twins are a blast to drive. I had mine going 7.8's in the 1/8th back 10yrs ago with just intake, exhaust, pettit IC and PFC computer.

i assume everyone with full exhaust also port their wastegates and installed boost controllers?

My wastegate is stock, and I have boost controlled by the PFC through Injector Duty Cycle. In the cold temps boost will push 13.5 psi, but in 60degree + I typicall top out at 12.5psi

Pretty cool. Would you happen to have a better view of the dyno plot? I'd like to see the low end of it as well.

Probably missed it, but I'm still confused. ^From this I assumed Doc was still on a stock ECU, but subsequent posts refer to his "tune" and the fact he has "99spec twins". So it is modified with a programable or reflashed ECU? And wouldn't 10 psi on 99 twins be the same as 10 psi on stock twins?

I'm not certain you'd get all that much of a challenge from the "other forum". I seem to remember some of the established guys there already mentioning serious gains to be made just with a DP, hi-flow cat and cat-back. Can't remember for sure, but the figure of 20 whp as being tossed around.

Here is my car's dyno sheet from last may.

Interesting.

Im making 336whp on a 99 motor, twins, 93 PFC, full 3" exhaust, intakes, and stock intercooler. However I am maxing out my injectors, need to upgrade to a SMIC, and properly duct it. Looking for 360whp ish.

reduced clearances do indeed make a huge flow difference on turbos like rad fans. those 99 turbos flow a lot more air than stock because of those abraded seals. if anyone disagrees tell them to remove their radiator fan shroud and see how little air they move then!

They're more efficient.....yes. Quicker spool...OK. But at a given pressure and at given intake temp...say stock boost levels.....10 psi is still 10 psi isn't it? No difference in max hp at the dyno. Or am I missing something?

Not necessarily. If they flow better, then 10psi is more hp than the one that doesn't flow as good, which is why most singles make more hp at the same boost level as twins. Boost is just backed up flow that can't get through the engine.

Also a more efficient turbo puts out less heat at the same pressure which will add to the HP gains.

The car has a y-pipe, exhaust with high flow cat, RB dual tip, down pipe, commander stand alone ecu, 99 spec turbo's, a careful rebuild on the engine, K&N air filter and Mazdaspeed inter-cooler. I expected about 300 HP to the rear wheels with this setup at 10 PSI and got 294, 12 PSI got me 314, about right. Intake is stock